Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Reilly Heights's December weather, marked by an average high temperature of 53.6°F (12°C) and an average low temperature of 37.4°F (3°C), is the coldest in the year.Humidity
In December, the average relative humidity is 76%.Rainfall
The months with the most rainfall in Reilly Heights are February and December, with an average 3.11" (79mm) of precipitation.Snowfall
January, March through December are months without snowfall in Reilly Heights.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year in Reilly Heights.On the first day of the month, sunrise is at 7:14 am and sunset at 4:51 pm. On the last day of December, in Reilly Heights, sunrise is at 7:33 am and sunset at 5:01 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.3h of sunshine.UV index
In December, the average daily maximum UV index in Reilly Heights is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A daily maximum UV index of 3 in December translates into the following instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. It's recommended to limit sun exposure when its radiation is at its peak during midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Frequently asked questions
What time of the year is the coldest in Reilly Heights?
What is the temperature in December in Reilly Heights?
What is the average humidity in December in Reilly Heights?
What is the wettest month in Reilly Heights?
How much does it rain in Reilly Heights in December?
When it does not snow in Reilly Heights?
What is the month with the shortest days in Reilly Heights?
What is the average length of the day in December in Reilly Heights?
When are sunrise and sunset in December in Reilly Heights?
What is the month with the least sunshine in Reilly Heights?
How long on average sun shines in December in Reilly Heights?
How high is the UV index in December in Reilly Heights?
Average temperature in December
Reilly Heights, CA
- Average high temperature in December: 53.6°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (53.6°F).
- Average low temperature in December: 37.4°F
The month with the highest average low temperature is July (53.6°F).
The coldest month (with the lowest average low temperature) is December (37.4°F).
Average pressure in December
Reilly Heights, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
Reilly Heights, CA
- Average wind speed in December: 4.5mph
The windiest months (with the highest average wind speed) are April, May and June (5.5mph).
The calmest month (with the lowest average wind speed) is November (4.2mph).
Average humidity in December
Reilly Heights, CA
- Average humidity in December: 76%
The month with the highest relative humidity is March (79%).
The months with the lowest relative humidity are July and September (58%).
Average rainfall in December
Reilly Heights, CA
- Average rainfall in December: 3.11"
The wettest months (with the highest rainfall) are February and December (3.11").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in December
Reilly Heights, CA
- Average rainfall days in December: 12.5 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is August (1.3 days).
Average snowfall in December
Reilly Heights, CA
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.04").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Reilly Heights, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Reilly Heights, CA
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 18min).
Average sunshine days in December
Reilly Heights, CA
- Average sunshine days in December: 17.6 days
The month with the most sunshine days is July (28.5 days).
The month with the least sunshine days is March (15.9 days).
Average UV index in December
Reilly Heights, CA
- Average UV index in December: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are February and November (UV index 2).
Average cloud cover in December
Reilly Heights, CA
- Average cloud cover in December: 42
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 6).
Average visibility in December
Reilly Heights, CA
- Average visibility in December: 5mi
The months with the highest visibility are February, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, March and December (5mi).
Reilly Heights, California, USA
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